A framework-specific collaboration adapter (FCA) provides a lightweight transformation process capable of converting single-user Web applications into their collaborative counterparts. Thereby, a local data structure of a local document instance is transformed into a shared data structure with concurrency control support. The FCA replays local document changes at all remote sites. To mark the data model within the source code of the original application, the original single-user Web application has to be enhanced with Source Code Annotations (SCA). The concurrency control system synchronizes all shared model instances that are distributed on the client-side as well as on the server-side.